Stamos, Christina L. McPherson, Kelly R. Sneed, Michelle Brandt, J.T. 2009 vector digital data Sacramento, California U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?cont2006 Stamos, Christina L., Glockhoff, Carolyn S., McPherson, Kelly R., and Julich, Raymond J. 2007 Scientific Investigative Report SIR 2007-5097 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2007/5097/ During 2006, the U.S. Geological Survey and other agencies made approximately 2,500 water-level measurements in the Mojave River and Morongo ground-water basins. These data document recent conditions and, when compared with previous data, changes in ground-water levels. A water-level contour map was drawn using data from about 680 wells, providing coverage for most of the basins. Twenty-five hydrographs show long-term (up to 70 years) water-level conditions throughout the basins, and 9 short-term (1997 to 2006) hydrographs show the effects of recharge and discharge along the Mojave River. In addition, a water-level-change map was compiled to compare 2004 and 2006 water levels throughout the basins. This data set is a digital representation of the contours presented on the map published in 2006, "Regional Water Table (2006) and Ground-Water-Level Changes in the Mojave River and the Morongo Ground-Water Basins, Southwestern Mojave Desert, California", by Stamos & others, U.S. Geological Survey SIR 2007-5097, and make the data available for use with geographic information systems. The Mojave River and the Morongo Ground-Water Basins are in the Mojave Desert region. The rapid growth in population in these basins, which is due, in part, to their proximity to Los Angeles, has increased the demand for water. Increased pumping to meet the needs of an increasing resident population has resulted in ground-water overdraft in parts of the ground-water basin (Stamos & others 2007). 2006 publication date Complete None planned -117.667216 -116.033856 35.047224 34.118136 ISO 19115 Topic Category inlandWaters inland waters water table water level contours drainage basin ground water ground-water groundwater hydrology levels USGS none Morongo Mojave Desert Southern California California San Bernardino County None These data should not be used at scales larger than 1:100,000. U.S. Geological Survey Steven K. Predmore Geographer mailing address

4165 Spruance Road, Suite 200

San Diego CA 92101 USA 1-888-275-8747 (1-888-ASK-USGS) spredmor@usgs.gov http://water.usgs.gov/GIS/browse/contours2006.png Ground water contours 2006 png Compilation of this data set and the associated metadata was funded in cooperation with the Mojave Water Agency. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770 Stamos, C.L., McPherson, K.R., Sneed, Michelle, and Brandt, J.T. 2007 map Scientific Investigations Report 2007-5097 Chain-node topology present. This data set includes all the 2006 water-table elevation contours published on SIR 2007-5097. A tiff file was obtained from the original Adobe Illustrator file used to create the original map. The tiff file was then georeferenced using known township corners. The contours were then digitized from the georeferenced tiff. 2006 The contours were edited to add the Line_type field and the wlevel field. 2006 Metadata imported. mojavemetadata2006.txt 20090413 16123700 Vector String 78 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000001 0.000001 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 National Geodetic Vertical Datum of 1988 25 feet Attribute values Cont2006 Shapefile Attribute Table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. contourval water level contour value author water level contour contour value is normally 50 feet author 25 feet contour value is normally 50 feet Line_type solid or dashed line author Dashed features where uncertain. 25 feet Dashed line where uncertain U.S. Geological Survey Ask USGS - Water Webserver Team mailing

507 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+cont2006 Downloadable Data Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. How To Get the Data ESRI Shapefile. ESRI Shapefile unzip. 189KB http://water.usgs.gov/GIS/dsdl/sir07-5097_Cont2006.zip None. This dataset is provided by USGS as a public service. 20090820 Kelly R. McPherson U.S. Geological Survey Geographer mailing

507 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) 916-278-3169 http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+cont2006 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998